The previous tweet is on a Wired Danger Room article. From DARPA's RFI linked in the article:

DARPA seeks an open-innovation approach to the development of algorithms for the control of the Synchronized Position, Hold, Engage, and Reorient Experimental Satellites (SPHERES) that operate inside the International Space Station. ... DARPA is interested in novel, out-of-the-box ideas for involving vast groups of people in SPHERES algorithm and software development, and potentially operations. Such concepts may involve, for instance, competitions, prize awards, massively-distributed collaborative development, viral campaigns, prediction markets, new ventures ...